What is the C# equivalent of NaN or IsNumeric?

Question

What is the most efficient way of testing an input string whether it contains a numeric value (or conversely Not A Number)? I guess I can use Double.Parse or a

Answer 1

I like the extension method, but don't like throwing exceptions if possible. I opted for an extension method taking the best of 2 answers here.

    /// 

    /// Extension method that works out if a string is numeric or not
    /// 
    /// string that may be a number
    /// true if numeric, false if not
    public static bool IsNumeric(this String str)
    {
        double myNum = 0;
        if (Double.TryParse(str, out myNum))
        {
            return true;
        }
        return false;
    }